274 THE CLIFF SWALLOW 



with the last named species, and the birds seem to have readied a modus 

 vivendi on peaceable grounds. 



At the end of the breeding season the Martins are no longer confined 

 to the nesting site, but range freely by day. and gather in large companies 

 to roost at night. Sometimes the ridge or cornice of a building is used fi >i 

 this purpose, but oftener the birds resort to some unfrequented woodland or 

 out-of-the-way place. In the summer of 1901 we saw upwards of a thou- 

 sand cf them roosting in the hackberry trees of North Harbor Island, and 

 had reason to believe that the company represented not only the entire popu- 

 lation of the Lake Erie Islands, but a considerable number from the Cana- 

 dian and Ohio mainland as well. 



No. 120. 



CLIFF SWALLOW. 



A. O. U. No. 612. Petrochelidon lunifrons (Say). 



Synonyms. — Have Swallow; Republican Swallow. 



Description. — Adult: A prominent whitish crescent on forehead; crown. 

 back, and an obscure patch on breast steel-blue; throat, sides of bead, and nape 

 deep chestnut; breast, sides, and a cervical collar brown-gray; belly white or 

 whitish; wings and tail blackish; rump pale rufous. — the color reaching around 

 on flanks ; under tail-coverts dusky. In young birds the frontlet is obscure or 

 wanting; the plumage dull brown above, and the throat blackish with white specks. 

 Bill and feet weak, the former suddenly compressed at tip. Length 5.00-6.00 

 (127.-152.4) ; wing 4.35 ( 110.5) : tail 2.00 (50.8) ; bill from nostril .22 (5.6). 



Recognition Marks. — "Warbler size," but comparison inappropriate, — bet- 

 ter say "Swallow size" ; white forehead and rufous rump. Found in colonies. 



